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Logarithmic singularity at crack tips in piezoelectric media

机译:压电介质中裂纹尖端的对数奇异性

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摘要

The Lekniskii- and Stroh-formalism are often used to study the crack-tip singularity of a two-dimensional anisotropic material, such as purely elastic material and piezoelectric media. The present work investigates the logarithmic singularity at cracktips in piezoelectricity. For a semi-infinite crack in an anisotropic piezoelectric media, it is shown that both stresses and electric displacements at crack tips may be in the order of r~(-1/2), or r~(-1/2)lnr, r~(-1/2)ln~2r, r~(-1/2)ln~3r, as r→0, where r is the distance from crack tip to field point, depending on which conditions are satisfied.
机译:Lekniskii和Stroh形式主义经常用于研究二维各向异性材料(如纯弹性材料和压电介质)的裂纹尖端奇点。目前的工作是研究压电尖端裂纹的对数奇异性。对于各向异性压电介质中的半无限裂纹,表明裂纹尖端处的应力和电位移可能约为r〜(-1/2)或r〜(-1/2)lnr, r〜(-1/2)ln〜2r,r〜(-1/2)ln〜3r,r→0,其中r是裂纹尖端到场点的距离,取决于满足的条件。

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